Here is a website with some range locations:
Shooting Ranges in Maryland - Wildlife and Heritage Service - Maryland Department of Natural Resources
I also have a question. I currently have a Glock 19 and my SO has a Glock 30. We have thought about getting a conversion kit (for mine) to be able to shoot .22 with my 9mm. (I believe Sig also makes or has conversion kits for some of their firearms also). Has anyone had any experience with doing this? I figured it would be great to practice fire the .22 rounds through the gun that I am already familiar with and it would only keep improving my accuracy (at a reduced cost). Thoughts? TIA!
Ceiner, Tactical Solutions and Advantage Arms all make conversion kits for Glocks to shoot 22's. I have a Tactical Solutions and it's been okay for me. It's a bit picky on ammo but I have read that sometimes it takes 500 or so rounds through them to get them to run reliably. In the meantime though I have become great at failure drills.
I also have a GSG 1911-22 to practice on Government Model style guns.
It is great to shoot for a couple hours for less money than a box of factory 9mm or 45acp. It will make a big difference in your shooting skills.